Jolting-machine.



W. 0. NORUROSS.

JOLTING momma.

APPLICATION FILED DEG. 7, 1910.

Patented Jan. 30, 1912.

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working in perfect unison.

UNITED STATES PATENT onr on.

WILLIAM G. NORCROSS, OF TERRE IIAUTE, INDIANA, ASSIGNOR T NOROROSS MOULDING MACHINE COMPANY, OF TERR-E HAUTE, INDIANA, A CORPORA- TION OF. INDIANA.

JoLTING-MAcHiNE.

To all whom it may concern Be it known that I, WIL IAu O. NORCROSS, a citizen of the United States, residing at Terre Haute, in the county of Vigo and State of Indiana, have invented new and useful Improvements in Jolting-Machines, of which the following is a specification.

This invention relates to machines for packing sand about a pattern in a mold by jarring or jolting the support on which the flask rests.

The present invention is a further development and improvement upon the machine shown in my former Patent No. 954,399, granted April th, 1910. In that patent but one cylinder and plunger were disclosed, which is entirely satisfactory for small work. But when the supporting table is of large dimensions, it is found that if only one cylinder is used, there is a vibration or rebound of the outer overhanging portions of said table at each blow, which interferes with the best results in packing the sand. I have therefore devised the present machine, in which there is a plurality of cylinders and plungers, each adapted to lift its share of the load and to assist in giving the necessary jar simultaneously at all points of the table. The practicability of this device is shown by the fact that a table measuring siX by twelve feet has been successfully operated by the use of three cylinders. Such a machine has a ramming capacity of over forty thousand pounds, the plungers It is evident that by the use of larger cylinders, or by multiplying them still further, a table of any desired dimensions can be operated.

In the accompanying drawing, Figure 1 is a perspective view of a large three-cylinder machine. Fig. 2 is a side elevation of the same, partly in section. Fig. 3 is a plan view of a machine having five cylinders, and Fig. t shows a smaller type having but two cylinders.

In each case, the machine comprises a heavy base plate 1, provided with seats 2 for the cylinders 3, which are erected on said seats and are fastened rigidly and immovably thereto. In each cylinder fits a plunger 4, provided near its bottom with an annular slide valve 5, all as set forth and covered in my patent as aforesaid. The middle cylinder is preferably larger than the others, but this is not essential. The

Specification of Letters Patent.

Application filed December 7, 1910.

Patented Jan. 30,1912.

Serial No. 596,164.

table 6 is secured upon the tops of all the plungers, and said plungers are of such length with respect to their respective cylinders that they will all strike upon the seats 2 at the same instant, thus giving the table a single uniform jolt at every point. In order to accomplish this to the best advantage, the cylinders should be located at the centers of percussion of the table, measuring from the center toward the ends or corners, as the case may be. In Figs. 3 and 4, the dotted circles indicate the proper location of the several cylinders with reference to the table whose outline is shown in full lines.

The plungers are lifted by compressed air, supplied through the pipe 7 to all the cylinders beneath the plungers; the exhaust taking place through the openings 8. The operation of the plungers is automatic, as explained fully in my patent aforesaid, the annular valves 5 being moved up and down by the plungers and serving to admit and exhaust the air alternately. At each exhaust, the plungers all strike upon the seats 2 and jar the table, the flask, and the sand contained therein. In order to secure econ omy in air consumption when operating with a light mold, the air may be cut off from the end cylinders and the lifting effected by means of the center cylinder alone. Cut-off valves 9 in the branch pipes 10 leading to said end cylinders permit either or both of them to be put out of service as may be desired.

WVhen only one cylinder is used for lifting, the plungers in the other cylinders not only act as guides to keep the table level in its up and down movements, but they also cooperate with the working plunger in giving the necessary jar, so that all of them act together when the table drops. This is essential, no matter what the load may be or where it may be placed on the table. It is this simultaneous blow on all the plungers that effects the proper packing of the sand without any injurious secondary vibrations of the overhanging portions of the table.

Having thus described my invention, what I claim is:

1. A sand molding machine, comprising a base plate, a plurality of upright cylinders rigidly fastened thereto, plungers in said cylinders, a table supported by all of said plungers, and means for supplying compressed air to all of said cylinders, said plungers being of such length that they will strike simultaneously upon said base plate When the table drops.

2. A sand molding machine comprising a base plate, a plurality of upright cylinders secured rigidly thereto, plungers in said cylinders, a table supported by all of said plungers, and means for supplying compressed air to all of said cylinders, said plungers being attached to the table at centers of percussion thereof, and all being adapted to strike simultaneously upon said base plate When the table drops.

3. A sand molding machine, comprising a base plate, a plurality of upright cylinders secured thereto, valved plungers in said cylinders, a table supported by said plungers, means for supplying compressed air to all of said cylinders, and means for cutting out any one or more of said cylinders, said plungers being adapted to strike simultaneously upon said base plate When the table drops.

In testimony whereof I have signed my name to this specification in the presence of two subscribing Witnesses.

WILLIAM C. NOROROSS.

WVitnesses:

STELLA M. THOMAS, JOHN D. BAKER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

